#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/System/Path.h"
#include "llvm/System/Process.h"
#include "llvm/System/Program.h"
#include <cassert>
#include <cstdio>
#include <cstring>
#include <cerrno>
#include <sys/types.h>
#include <sys/stat.h>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#include <sys/uio.h>
#else
#include <io.h>
#endif
#include <fcntl.h>
using namespace llvm;
MemoryBuffer::~MemoryBuffer() {
if (MustDeleteBuffer)
free((void*)BufferStart);
}
void MemoryBuffer::initCopyOf(const char *BufStart, const char *BufEnd) {
size_t Size = BufEnd-BufStart;
BufferStart = (char *)malloc(Size+1);
BufferEnd = BufferStart+Size;
memcpy(const_cast<char*>(BufferStart), BufStart, Size);
*const_cast<char*>(BufferEnd) = 0; MustDeleteBuffer = true;
}
void MemoryBuffer::init(const char *BufStart, const char *BufEnd) {
assert(BufEnd[0] == 0 && "Buffer is not null terminated!");
BufferStart = BufStart;
BufferEnd = BufEnd;
MustDeleteBuffer = false;
}
namespace {
class MemoryBufferMem : public MemoryBuffer {
std::string FileID;
public:
MemoryBufferMem(StringRef InputData, StringRef FID, bool Copy = false)
: FileID(FID) {
if (!Copy)
init(InputData.data(), InputData.data()+InputData.size());
else
initCopyOf(InputData.data(), InputData.data()+InputData.size());
}
virtual const char *getBufferIdentifier() const {
return FileID.c_str();
}
};
}
MemoryBuffer *MemoryBuffer::getMemBuffer(StringRef InputData,
const char *BufferName) {
return new MemoryBufferMem(InputData, BufferName);
}
MemoryBuffer *MemoryBuffer::getMemBufferCopy(StringRef InputData,
const char *BufferName) {
return new MemoryBufferMem(InputData, BufferName, true);
}
MemoryBuffer *MemoryBuffer::getNewUninitMemBuffer(size_t Size,
StringRef BufferName) {
char *Buf = (char *)malloc(Size+1);
if (!Buf) return 0;
Buf[Size] = 0;
MemoryBufferMem *SB = new MemoryBufferMem(StringRef(Buf, Size), BufferName);
SB->MustDeleteBuffer = true;
return SB;
}
MemoryBuffer *MemoryBuffer::getNewMemBuffer(size_t Size,
const char *BufferName) {
MemoryBuffer *SB = getNewUninitMemBuffer(Size, BufferName);
if (!SB) return 0;
memset(const_cast<char*>(SB->getBufferStart()), 0, Size+1);
return SB;
}
MemoryBuffer *MemoryBuffer::getFileOrSTDIN(StringRef Filename,
std::string *ErrStr,
int64_t FileSize,
struct stat *FileInfo) {
if (Filename == "-")
return getSTDIN();
return getFile(Filename, ErrStr, FileSize, FileInfo);
}
namespace {
class MemoryBufferMMapFile : public MemoryBuffer {
std::string Filename;
public:
MemoryBufferMMapFile(StringRef filename, const char *Pages, uint64_t Size)
: Filename(filename) {
init(Pages, Pages+Size);
}
virtual const char *getBufferIdentifier() const {
return Filename.c_str();
}
~MemoryBufferMMapFile() {
sys::Path::UnMapFilePages(getBufferStart(), getBufferSize());
}
};
}
MemoryBuffer *MemoryBuffer::getFile(StringRef Filename, std::string *ErrStr,
int64_t FileSize, struct stat *FileInfo) {
int OpenFlags = 0;
#ifdef O_BINARY
OpenFlags |= O_BINARY; #endif
SmallString<256> PathBuf(Filename.begin(), Filename.end());
int FD = ::open(PathBuf.c_str(), O_RDONLY|OpenFlags);
if (FD == -1) {
if (ErrStr) *ErrStr = strerror(errno);
return 0;
}
if (FileSize == -1 || FileInfo) {
struct stat MyFileInfo;
struct stat *FileInfoPtr = FileInfo? FileInfo : &MyFileInfo;
if (fstat(FD, FileInfoPtr) == -1) {
if (ErrStr) *ErrStr = strerror(errno);
::close(FD);
return 0;
}
FileSize = FileInfoPtr->st_size;
}
if (FileSize >= 4096*4 &&
(FileSize & (sys::Process::GetPageSize()-1)) != 0) {
if (const char *Pages = sys::Path::MapInFilePages(FD, FileSize)) {
::close(FD);
return new MemoryBufferMMapFile(Filename, Pages, FileSize);
}
}
MemoryBuffer *Buf = MemoryBuffer::getNewUninitMemBuffer(FileSize, Filename);
if (!Buf) {
if (ErrStr) *ErrStr = "could not allocate buffer";
::close(FD);
return 0;
}
OwningPtr<MemoryBuffer> SB(Buf);
char *BufPtr = const_cast<char*>(SB->getBufferStart());
size_t BytesLeft = FileSize;
while (BytesLeft) {
ssize_t NumRead = ::read(FD, BufPtr, BytesLeft);
if (NumRead > 0) {
BytesLeft -= NumRead;
BufPtr += NumRead;
} else if (NumRead == -1 && errno == EINTR) {
} else {
if (ErrStr) *ErrStr = strerror(errno);
close(FD);
return 0;
}
}
close(FD);
return SB.take();
}
namespace {
class STDINBufferFile : public MemoryBuffer {
public:
virtual const char *getBufferIdentifier() const {
return "<stdin>";
}
};
}
MemoryBuffer *MemoryBuffer::getSTDIN() {
char Buffer[4096*4];
std::vector<char> FileData;
sys::Program::ChangeStdinToBinary();
size_t ReadBytes;
do {
ReadBytes = fread(Buffer, sizeof(char), sizeof(Buffer), stdin);
FileData.insert(FileData.end(), Buffer, Buffer+ReadBytes);
} while (ReadBytes == sizeof(Buffer));
FileData.push_back(0); size_t Size = FileData.size();
MemoryBuffer *B = new STDINBufferFile();
B->initCopyOf(&FileData[0], &FileData[Size-1]);
return B;
}